A real number or a category characterizing the statistical properties of a given dataset.
See also
Formal science / Mathematics / Statistics
Natural Science / System / Model
[ Expectation operator E ][ Mean value (μ) ] [ Variance ( \mu_2)] [ Standard deviation (σ) ][ Skewness ( \bar \mu_3) ]
[ Central momentum ( \mu_n) ][ Standardized central momentum ( \bar \mu_n) ]